With that setup and considering what I know of broadhead performance I would suggest a quality fixed blade head with a smaller cutting diameter. These are the ones I would look at. Rocky tradition, Wasp boss bullet, American broadheads Sonic, Magnus stinger two blade 100 or 85 grn 4 blade, Muzzy 75 grn. All of these heads have smaller cutting diameters and penetrate very well. Their are a few mechanicals that may work with perfect shots, but I would stick with a good fixed blade head. Thunderheads are excellent and I won't steer you from them, but the heads listed above have proven to penetrate soft tissue better than anything else I have tested. There are also several new heads coming out this year that may work as well but I have not tested them so I can't say for sure.